The most popular screen printing in plate making p

2022-08-01
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Significant development of silk printing in plate making photoresist

China's silk printing materials such as silk, photoresist and ink have made great progress, but there is still a certain gap compared with the printing materials produced by foreign advanced manufacturers, and they are extremely sensitive to the risk of experiments, such as high-strength, low elongation high mesh silk; High sensitivity non diazo photosensitive adhesive; UV ink, water-based ink, etc

photosensitive adhesive

great progress has been made in plate making photosensitive adhesive for silk printing in China, and diazo photosensitive adhesive can meet the needs. The long-standing manual engraving plate making method, i.e. tracing and drawing plate making method and dichromate plate making method are basically replaced by diazo photosensitive (or diazo salt) plate making method with higher resolution. The water-resistant and solvent resistant diazo photosensitive adhesives produced in China are close to the foreign advanced level in the use effect, and can meet the requirements of template making with general accuracy

1. Dichromate photosensitive adhesive

dichromate +ova (early protein). The storage period is shortened due to dark reaction, and the use of heavy metals has been restricted due to public hazards

2. Diazo photosensitive adhesive

① diazo resin +pva+ polymer emulsion. According to the mix proportion of PVA and polymer emulsion, it has solvent resistance and water resistance. Since the absorption peak is around 375nm, it is appropriate to use metal halogen lamp or ultra-high pressure mercury lamp. Due to less odor and skin irritation, this kind of photosensitive liquid is easy to modulate, easy to remove film and regenerate, and relatively cheap

② diazo resin +pva+ polymer emulsion + acrylate monomer. Acrylate monomer dissolved in photopolymerization initiator is added to the composition of diazo resin, PVA and polymer emulsion. It is hardened at the same time according to the cross-linking reaction of diazo resin and the polymerization reaction of acryloyl group. Due to the increase of polymerization and crosslinking of acrylate, the water resistance and solvent resistance are improved, so that the high resolution and edge sharpness are also improved

silk

at present, the annual import volume of silk in China has reached more than 1million m, and the imported products are mainly polyester and nylon with more than 270 mesh. High density yarn with high technical content, high strength and low elongation yarn, anti-static yarn, calendering and other special treated yarn and polyester high mesh yarn all need to break through the new technology of chlor alkali production by full film process and complete set mouth

domestic polyester yarn and nylon yarn have a good market, and a small amount of polyester yarn is exported, but the types and specifications of domestic yarn are too few, and high-quality, high mesh and wide width yarn need to be developed

foreign countries have developed a new type of non-woven silk, which overcomes the trouble of coating photosensitive tape at the junction of the warp and weft of traditional silk. Modern advanced ultra-fine graphic printing, fine level printing, high-precision positioning printing, special ink quantitative printing and large-scale color step printing all put forward higher requirements for the used silk, such as high strength, low elongation, repeatability, consistency, long service life, etc; For example, after the printed electronic micro element is loaded into a certain load, it can not be used for high-tech products such as parts, integrated circuits, multilayer printed circuits, fluorescent digital displays, aerospace instrument flat panel displays, etc; For example, some printing requires anti-static, metallization, physical, chemical treatment or silk made of special materials

recently, the precision of printed circuit boards and electronic components is obvious, and the requirements for the accuracy of size and position are very high. In addition to polyester, polyamide and stainless steel in the past, there are also yarns with high tensile polyester as the core and polyamide as the core sleeve. It is made of polypropylene fiber, with 330 mesh eyes, 23 m longitude and 36 m interweaving. It can obtain high tension by measuring the dynamic friction coefficient of plastic film and sheet. It is really an epoch-making silk. Moreover, in order to meet the requirements of precision, these wires have been treated by plasma, metal evaporation, polishing and other processes

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